FIG. 4.

Partial enzyme restriction map of the bla gene in pBR322 depicting the insertion site for the construction of translational fusions involving the hgbA, hgbB, and hgbC genes. The three shaded bars denote the three PCR-derived DNA fragments inserted into the PstI site in pBR322 to construct pHgbA-FP, pHgbB-FP, and pHgbC-FP. The nucleotide numbers were derived from the restriction maps shown in Fig. 2.